I have a Petri Racer, really pretty camera, maybe a little fragile though. Also have a couple of Petri SLR's, they have a well deserved reputation for unreliability, but are interesting cameras none the less. No collection is complete without a Petri or two, and one of those Contarex look-a-like 7's would be nice if they weren't overpriced.
I find their lenses quite good, especially on the rangefinders, not Nikon quality, but better than you would expect.